Advantages of salient pole type construction used for Synchronous machines?

Advantages of salient-pole type construction are :

  • They allow better ventilation
  • The pole faces are so shaped that the radial air gap length increases from the pole center to the pole tips so that the flux distribution in the air-gap is sinusoidal in shape which will help the machine to generate sinusoidal emf
  • Due to the variable reluctance the machine develops additional reluctance power which is independent of excitation